The Duchess of Cambridge has had Ms Deacon at her side since she got married Credit:
Chris Jackson /Getty

The news comes after reports Ms Deacon is engaged to Adam Priestley and will marry later this month. She has reportedly been given permission to hold the ceremony at the Chapel Royal at St James's Palace because of her links to the Royal Family.

Often seen standing discreetly behind her royal boss during engagements, Ms Deacon played an important role during the Duke and Duchess' wedding.

She has served the royal family for 10 yearsCredit:
Dominic Lipinski/PA

A private secretary's duties include organising official programmes and engagements and ensuring Kate is briefed on who she is going to meet.

Before joining William and Kate's household Ms Deacon worked for Prince Harry's charity Sentebale.

Ms Deacon will marry later this monthCredit:
Garcia/BPI/REX/Shutterstock

A Kensington Palace spokeswoman said: "After a decade of service to the Duke and Duchess of Cambridge and Prince Harry, Rebecca Deacon will be stepping down as private secretary to the Duchess of Cambridge. She plans to leave the household in the summer.

"Their Royal Highnesses are incredibly grateful for all the hard work and support Rebecca has provided over the past ten years, and wish her well in the next phase of her career."